<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../js/vue.js"></script>
    <style>
        #app{
            width: 600px;
            margin: 40px auto;
        }
        .outer{
            display: flex;
            margin-bottom:20px;
        }
        .inner{
            padding: 0 10px;
            text-align: center;
            min-width: 100px;
            border-bottom: 1px solid #000;
            font-weight: bold;
            color:red;
        }
    </style>
</head>
<body>
    <div id="app">
        <div class="outer">今天天气不错，我准备
            <div class="inner">{{activity}}</div>
        </div>
        <advice @advice="receiveAdvice"></advice>
    </div>
</body>
<script>
    Vue.component('advice',{
        data(){
            return{
                arr:['打篮球','野炊','游泳','宅在家','复习迎考']
            }
        },
        template:'<button @click="giveAdvice">给出建议</button>',
        methods:{
            giveAdvice:function(){
                let msg = this.arr[Math.floor(Math.random()*this.arr.length)]
                this.$emit('advice',msg)
            }
        }
    })

    let vm = new Vue({
        el:'#app',
        data:{
            activity:''
        },
        methods:{
            receiveAdvice(msg){
                this.activity = msg
            }
        }
    })
</script>
</html>